"Peridot" is the name of a semi-precious gemstone found in volcanic rocks throughout South Africa, Australia, Russia and the Northwest United States. It is a light to lime green color, and high quality peridot is used in jewelry.
The word peridot was used to refer to many different types of green or yellow gems as far back as the 13th century. Now, peridot refers specifically to green olivines. In popular culture, the stone is associated with compassion, good health and peaceful relationships. Peridot is the birthstone for the month of August and is given as a gift for the 16th year of marriage.